Straining-pin for piano-fortes



(No Model.) 4

0, L. TRIPP. STRAINING PIN FOR PIANO FORTES.

No. 442,557. Patented Dec. 9, 1890.

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UNITE STATES PATENT OFFICE.

CHESTER L. TRIPP, OF NEIV BEDFORD, MASSACHUSETTS.

STRAlNlNG-PIN FOR PIANO-FORT ES.

SPECIFICATION forming part of Letters Patent No. 442,557, dated December9, 1890.

Application filed Tannery 7, 1889. Serial No, 295,707. (No model.)

T0 at whom it may concern:

Be it known that I, CHESTER L. TRIPP, a citizen of the United States,residing at New Bedford, in the county of Bristol and State ofMassachusetts, have invented a new and useful Improvement inStraining-Pins for Piano- Fortes, of which the following is aspecification.

My invention is only applicable to that class of planos in which thestringplate has a straining-abutment projecting at right angles from thesame and provided with apertures for the straining-pins in line with thedraft of the strings.

My invention is a straining-pin for the above-described class of pianos;and it consist-s of a round bar of metal provided with a screw-thread ina portion of its length, a wing or projection extending from the side ofsaid bar next contiguous to the screw-threaded portion, a notch in theside of the said bar near the end opposite from the screw-th readedportion adapted to receive the loop in the end of a piano-string, theend of said bar below the said notch brought to a point, and a nut tofit the screw-threaded portion of the bar and bear against the upperside of the straining-abutment.

In the accompanying drawings, Figure l is a view in cross-section of thestraining-abutment through the apertures made to receive thestraining-pins, showing the straining-pin as it appears when in place,with the pianostring attached to its end in a proper manner. Fig. 2 is aplan view of a section of the top of the straining-abutment, showing thegroove in the side of the aperture which receives the wing or projectionon the side of the straining-pin.

In Fig. 1, 6 represents the straining-abutment of a piano-forte, and 0,represents the straining-pin screw-threaded in a portion of its lengthand provided with the flanged nut 11.

0 represents a wing or projection formed on the pin a.

m represents a notch formed in the side of the pin'and near its lowerend adapted to receive the loop 0 of the piano-string d. The lower endof the pin below the notch m is pointed, as at n, so as to conformsomewhat to the shape of the loop 0 when under strain and cause thedraft of the string to be from the center of the end of thestraining-pin.

The operation of the device is as follows: The straining-pin beingadjusted, as shown in Fig. l, with the string (I attached, the nut b isturned to the right and the string (1 drawn to the proper degree oftension. While this is being done the projection 0 follows the groove hand prevents the straining-pin from turning with the nut 19.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

In combination with the string-plate of a piano having astraining-abutment projecting at right angles with said plate and havingthe aperture for the straining devices in line with the tension of thestrings and each provided with a longitudinal groove in the sidethereof, a straining-pin consisting of the round bar a, havingscrew-thread r, the wing 0, adapted to engage with the groove h in thestraining-abutment, the notch m, adapted to receive the loop in the endof the piano-string, the pointed end n, whereby the piano-string iscaused to draw from the center of the end of the pin, and a nut 1),adapted to engage with the screw-thread rand bear against the upper sideof the straining-abutinent, all as shown and described.

CHESTER L. TRIPP.

Witnesses:

THOS. M. JAMES, HENRY W. MAsoN.

